A dual gate valve includes two valve plates that open and close two openings of a valve box, a support bar that supports the two valve plates, a valve rod connected to the support bar, and an operation unit that performs an open and close operation of the two valve plates via the valve rod. The support bar and the valve plate linearly and elongatedly extend in a lateral direction perpendicular to a central axis of the valve rod. The valve rod is connected to a central portion in the long direction of the support bar, and one and the other of the two valve plates are tiltably attached to one end and the other end in the long direction of the support bar via elastic members, respectively.

The present disclosure provides a modular linear actuated valve having a lower body module that can interface with an interchangeable upper linear actuator module being at least one of a mechanical linear actuator module and a fluid linear actuator module. The invention includes a quick disconnect between the body module and any of the actuator modules. An actuator assembly on the selected actuator module can be coupled to the valve stem on the lower body module using a quick disconnect segment on the actuator module and a reciprocal quick disconnect segment on the body module. A valve can be quickly converted into a mechanical linear actuated valve or a fluid linear actuator valve, simplifying manufacturing and stocking, and providing a faster response to customer orders.

A method for installing a valve for use in oil and gas production or similar applications includes inserting seats and biasing members into a cavity of the valve and causing the seats to moving axially apart from each other, such that the biasing members are compressed and the flow barrier of the valve may be installed between the seats.

The invention relates to a slide valve (20) having a slide valve plate (32) movable in a slide valve rail (29) between a locked position and an open position in a slide valve casing (26), said slide valve rail (29) being provided with a slide valve seal for attaining a gas-proof locked position, said slide valve rail (29) being connected to the slide valve casing (26) via a flange connection in such a manner that the slide valve rail (29) is removable from the slide valve casing (26) radially to a flow axis of the slide valve (20).

Pipeline apparatus comprising a housing including a riser and a pipeline connector and a device configured to interact with fluid flowing through the pipeline connector, a mounting means for releasably mounting the device in the riser and seal means situated between an inner surface of the riser and an outer surface of the mounting means, the seal means configured to seal against egress of fluid from the apparatus, the mounting means and the riser each including a part of a locking means for releasably locking the device in the riser, the device situated in the pipeline connector.

A valve seat comprising a primary retention component to retain the valve seat in a valve seat housing upon seating of the valve seat in the valve seat housing, and a secondary retention component to at least temporarily retain the valve seat in the valve seat housing during seating of the valve seat in the valve seat housing, whereafter the valve seat is primarily retained in the valve seat housing via the primary retention component.

A knife gate valve with an interior channel divided by an interior channel configured to receive a valve gate, the valve gate can travel along the interior channel. A removable first wear ring is disposed on the upstream side of the interior channel, the first wear ring substantially lining the upstream side of the interior channel; and a removable second wear ring disposed on the downstream side of the interior channel, the second wear ring substantially lining the downstream side of the interior channel; a first retainer ring adjacent to the gate on the upstream side of the valve; and a second retainer ring adjacent to the gate on the downstream side of the valve is disclosed. Other embodiments are also shown.

A spacer having a wedge-shaped flat plate portion and an engagement protrusion is interposed between a hole end surface of mounting hole of a valve plate and a rod end surface of mounting portion of a valve rod, which thereby forms a wedge-shaped gap between the spacer and the hole end surface so as to open frontward. A fastening force of a valve-plate fixation screw generates a moment M that deforms the valve plate in a direction of narrowing the gap. At the same time, the engagement protrusion of the spacer is pressed into a wedge-shaped space between the inclined surface portion of the rod end surface and the rear hole-wall surface of the mounting hole, which causes the front hole-wall surface of mounting hole of the valve plate to press the rod front surface of mounting portion of the valve rod.

A method for installing a valve for use in oil and gas production or similar applications includes inserting seats and biasing members into a cavity of the valve and causing the seats to moving axially apart from each other, such that the biasing members are compressed and the flow barrier of the valve may be installed between the seats.

A gate valve is disposed between first and second chambers and allows a first opening leading to the first chamber and a second opening leading to the second chamber to be communicated and opens and closes. The gate valve includes a valve shaft, first and second valve plates that are attached to a leading end part of the valve shaft, an operation mechanism that moves these valve plates to an evacuation position at which the first opening and the second opening are communicated, a first closed position at which the first opening is closed by the first valve plate, and a second closed position at which the second opening is closed the second valve plate by operating the valve shaft, a fastening mechanism that attaches these valve plates to the valve shaft, and a support mechanism that fasten both end parts of these valve plates in a longitudinal direction.